What is permeable paving?

Permeable paving refers to surfacing materials or systems designed to allow water to pass through the paving layer rather than running off into drains or flooding the surface. Water drains either through the material itself (as with porous asphalt or permeable concrete) or through joints between units (as with porous block paving with gravel-filled gaps or resin-bound surfaces). Beneath the surface lies a permeable base layer that catches and stores water or channels it into the ground.

This approach solves a practical problem in built environments. Hard, impermeable surfaces concentrate rainfall into sudden rushes of water that strain drainage systems and increase flooding risk, particularly in dense areas. Planning authorities and building regulations increasingly require permeable paving solutions for new driveways, car parks, and patios to manage stormwater on-site and reduce downstream flooding. It also reduces reliance on piped drainage systems.

Permeable paving comes in several forms: permeable blocks or flags (clay, concrete, or stone) laid over a porous sub-base, porous asphalt, permeable concrete, and gravel or hoggin surfaces bound with resin or left loose. Each method suits different locations and traffic loads. In Cheltenham, where many properties have traditional paved driveways, permeable alternatives offer compliance with modern drainage requirements without sacrificing durability or appearance.